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The motion which delivers the
warp from the warp beam at the required rate that a suitable constant tension
by unwinding it from a flanged bobbin called let off motion.

Functions of let off motion:

To apply tension on warp to help to form a clear
shed.

To deliver the warp sheet from the warp beam.

To provide the warp and filling space during weaving.

Shirley Let Off Motion:

Construction: The warp which
supplied from the warp beam and passed over the floating back rest. The
floating back rest is connected with an angular lever arm and other end if the
lever is fulcrum. The beam barrel is joined with a roller. On the weight lever,
the sliding weight is placed which can slide left and right as and when
required.

Working Principle:

Constant take up rate equal to the constant let off
rate, when warp tension is increases.